luhn-generator/update/node_modules/babel-plugin-transform-undefined-to-void/lib/index.js

A generator of numbers that passes the validation of Luhn algorithm or Luhn formula, also known as the 'modulus 10' or 'mod 10' algorithm

"use strict";

module.exports = function ({
  types: t
}) {
  const VOID_0 = t.unaryExpression("void", t.numericLiteral(0), true);
  return {
    name: "transform-undefined-to-void",
    visitor: {
      ReferencedIdentifier(path) {
        if (path.node.name === "undefined") {
          path.replaceWith(VOID_0);
        }
      }

    }
  };
};